2004

7.8

2000

7.1

2006

7.9

2006

6.2

2006

0.8

2002

8.5

1995

6.8

1985

2.0

1996

7.7

2006

6.1

1968

5.9

1984

5.9

1974

6.9

2003

4.9

1989

8.3

2002

8.0

1985

5.3

2004

6.8

1976

7.1

1982

5.6